Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 215
URCH UGHTinQ, FlQ.e This angle is 39° 10, giving an areaon the reference plane of approximately1700 square feet. 200 THE ILLUMINATING ENGINEER (april) … THE ILLUMINATING ENGINEER (arun.) 201 values show a heaping up of the illumina-tion towards the middle of the room.The figures are given in Tablj VI. Table VI.Comparison of Kesults. Fig. 11. Position. Calculated value of horizontal illumination. Observedvalues. A.BC. 1-601-44 1-88 1-51-51-5 falling…
Lighting
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